He Fangcheng, Tang Zhenzeng, Li Jiawei, Shi Yiwei. Ultrasonic Inspection of Freckle(channel) and White Spot Segregation in GH169 Alloy Unit[J]. Journal of Materials Engineering, 1996, 0(10): 3-5.
Ultrasonic inspection is carride out on typical specimen have been obtained.The ultrasonic testing of freckle(channel)and white spot segregation in GH169 alloy had been studied.
Mo Anlai, Wang Song, Kang Lihong. Development of Ultrasonic C-Scan System Applied to Inspect the Torus Brazing with Honeycomb[J]. Journal of Materials Engineering, 1996, 0(10): 6-8,22.
Ultrasonic c-scan system applied to inspect the torus has been developed,in which the directly digital imaging and programmable sample scanning are used.The testing result is displayed on the screen of the computer terminal after analysis and processing accurately.
Xu Zhongmin. Theoretical Computation of Demagnetic Field and Demagnetic Factor of Magnetic Powder[J]. Journal of Materials Engineering, 1996, 0(10): 9-10.
According to the setted physical model and the mathematical model, theoretical computation is made in detail about the single spherical magnetic powder′s demagnetic field and demagnetic factor in the magnetic leakage field.These provide a certain theoretical base for research of analysis strength-bearing of magnetic powder and so on.
Fu Yang, Cao Yuling, Wang Ziming. Applications of Industrial Computed Tomography for Evaluation of Castings[J]. Journal of Materials Engineering, 1996, 0(10): 11-13.
The industrial computed tomography applications for casting flaw detection,wall thickness measurements and procedures controlling are introduced.
Ren Rongzhen, Yuan Zhenmin, Hou Jidong. Acoustic Emission Detection of Composite Pressure Vessle[J]. Journal of Materials Engineering, 1996, 0(10): 14-16,25.
The pressure cylinder being made of aramid fiber reinforced resin matrix composite has been studied by means of acoustic emission technique.The resutls show that the Felicity's ratio is an important acoustic emission parameter for evaluating the inner failure of a pressure cylinder and has a direct effect on blasting strength.High amplitude events can be indications of a cylinder blast.
Wang Zhiming. Analysis of the Ultrasonic Inspection Signals in High Temperature Alloy Forged Pieces[J]. Journal of Materials Engineering, 1996, 0(10): 17-19,39.
The dynamic and static characteristic of the ultrasonic wavetorm,the distribution of defects in forged pieces and the process of inspected piece had been synthetically reviewed.The Characteristic and low of Ultrasonic signals reflacted from the forged pieces had heen summarized.It is a reference basis that is been provide for the reliability of a quality evaluation with NDT.
Su Fei, Wang Ziming. Study on the Quantitative NDT Method for Scattering Particles in the Polycrystalline-Magnesium-Fluoride Dome for Missile[J]. Journal of Materials Engineering, 1996, 0(10): 20-22.
The technology of CCD photographing and digital image processing through computer were used to test quantitatively for scattering particles in the polycrystalline-magnesium-fluoride(MgF2)dome of missile,its accessory facilities──SG-95 type of scattering particles testing sysytem had been designed and manufactured,80, engineering quantitative test and automatic count of scattering particles in the MgF2 missile dome was realised for the first time. The accuracy of the testing system was better than 10μm.
Peng Yingqiu, Li Jian, Xue Lihua, Zou Tao. Non-conventional Ultrasonic Testing Technique for Small Bars and Study of Relevant Theory[J]. Journal of Materials Engineering, 1996, 0(10): 23-25.
A single probe creeping longitudinal wave ultrasonic immersed focusing method is introduced.It is suited for testing bars in pmall diameter.The theory, which is relevant to this method,has beer discussed and reviacved.
Liang Jing, Shi Yiwei, Han Bo, Tang Zhenzeng, Li Jiawei, Zhou Yuxian. Ultrasonic Inspection of Small Inclusion in Powder Metallurgy Materials[J]. Journal of Materials Engineering, 1996, 0(10): 26-28.
In the case of powder metallurgy materials,the most important fact causing incipient crack formation which can reduce the life of fatigue is inclusions.This paper introduces the method and results of smallinclusion detected by Ultrasonic,compares the testing capability of different frequency and discusses the characterise and size of the inclusion in the dissected specimen.
Jiang Futang, He Shuangqi, Shen Jianzhong. A Discussion of Some Questions about Lamb Waves in Nondestructive Testing[J]. Journal of Materials Engineering, 1996, 0(10): 29-31.
Some questions about Lamb waves in nondestructive testing of thin metal sheet were discussed in this paper. The calculation formula of energy distribution along thickness of sheet was advanced.It was shown that amplitude distribution of particle displacement could not be taken as the energy distribution and the uniformity of the energy distribution could not be used as principal criterion for optimum detection paramater. Furthermore,the generation of Lamb waves,the mechanism of the interaction between delamination and Lamb waves,the method of choosing optimum detection parameter were given primarily.
Shi Yiwei. Leaky Rayleigh Wave Imaging for the Inspection of Surface Flaws on Ceramics[J]. Journal of Materials Engineering, 1996, 0(10): 32-35.
The method of leaky Rayleigh wave surface flaw imaging on ceramics using conventional high frequency ultrasonic C-scan system is described.Some testing examples are presented.The characteristics of leaky Rayleigh wave imaging with high frequency focusing transducer are discussed.
